Lake Pend Oreille
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|Lake Pend Oreille|
|Location||Bonner / Kootenai counties, Idaho, United States|
LAKE PEND OREILLE Latitude and Longitude:
|Primary inflows||Clark Fork River, Pack River, Trestle Creek|
|Primary outflows||Pend Oreille River|
|Basin countries||United States|
|Surface area||148 sq mi (383 km2)|
|Max. depth||1,150 ft (351 m)|
Lake Pend Oreille ( //)  in the northern Idaho Panhandle is the largest lake in the U.S. state of Idaho and the 38th-largest lake by area in the United States, with a surface area of 148 square miles (380 km2). It is 43 miles (69 kilometers) long, and 1,150 feet (350 meters) deep in some regions, making it the fifth-deepest in the nation. It is fed by the Clark Fork River and the Pack River, and drains via the Pend Oreille River. It is surrounded by national forests and a few small towns, with the largest population on the lake at Sandpoint. The majority of the shoreline is non-populated. All but the southern tip of the lake is in Bonner County. The southern tip is in Kootenai County and is home to Farragut State Park, formerly the Farragut Naval Training Station during World War II of which a small part is still active and conducts US Navy acoustic underwater submarine research.  
The surrounding forests consist of ponderosa pine, Douglas fir, red cedar, poplar, quaking aspen, hemlock, paper birch and western larch.   Local animal species include white-tailed deer, elk, gray wolves, moose, mice, squirrels, black bears, grizzly bear, coyotes and bobcats, along with bald eagles, osprey, owls, hummingbirds, hawks, woodpeckers, ducks and the mountain bluebird. The lake is a home for several species of migratory water fowl.
Lake Pend Oreille was glacially formed during the ice age. It is also believed that the eastern side of the lake was in the path of the ancient Missoula Flood. The lake sits at the south end of the Purcell Trench,  carved by glaciers moving south from Canada. The eastern side of the glacier is believed to have formed the dam for the Missoula flood, at the point where the Clark Fork river enters the lake between the Cabinet and Bitterroot mountains. The lake is made slightly larger by the dam at Albeni Falls, just east of Oldtown, Idaho. The dam is 90 feet (27 m) high and operated by the Army Corp of Engineers. Along with Crater Lake, Lake Tahoe, Lake Chelan, and Lake Superior, it ranks as one of the five deepest lakes in the United States.
The area around the lake is the traditional home of the Kalispel Indian peoples. David Thompson established a North West Company trading post on the lake in 1809. A Canadian fur trader in Thompson's party is believed to have given the lake its name. The words "Pend Oreille" are French for an ear-hanging or pendant. Ear pendants were characteristic of the Kalispel tribe. The lake is shaped much like a human ear when viewed from above or on a map.
During World War II, the south end was the second largest naval training ground in the world. Built as a result of the Japanese attack on Pearl Harbor, the training station is now Farragut State Park. The lake is still used by the Navy's Acoustic Research Detachment to test large-scale submarine prototypes: the significant depth gives acoustic properties similar to the open ocean. 
The following towns are adjacent to the lake:
The lake is viewed from the Pend Oreille Scenic Byway, State Highway 200 along the north shore. Much of the shore is mountainous. The mountains to the east are the Green Monarchs; to the north are the Cabinet Mountains; to the southwest the Coeur d'Alene Mountains; and to northwest are the Selkirk Mountains.
For more information on the geology of Lake Pend Oreille see
- Alt, David. Glacial Lake Missoula and Its Humongous Floods. Missoula, MT: Mountain Press Publishing Co., 2001
The lake is home to many species of fish, including rainbow trout, lake trout, perch, black crappie, largemouth bass, smallmouth bass, whitefish, walleye, northern pike and kokanee. Lake Pend Oreille is also the home of the 37-pound (17-kilogram) state record Kamloops rainbow trout caught by Wes Hamlet in 1947. 
- Idaho Fish and Game
- Lake Pend Oreille Idaho Club volunteer, nonprofit interested in kokanee survival for the benefit of restoring the Gerrard Rainbow fishery. The club's primary goal is to protect and enhance Lake Pend Oreille.
- Pend Oreille Basin Commission formed to oversee any issues relating to water quality and/or water quantity in Lake Pend Oreille, Pend Oreille River, Priest Lake and Priest River Basin
- Tri-State Water Quality Council Citizens, business, industry, tribes, government and environmental groups combined to oversee the Clark Fork-Pend Oreille river system
- Kaniksu Land Trust non-profit land trust serving Sanders County, Montana and Bonner County, Idaho
- Inland Northwest Land Conservancy non-profit land trust serving eastern Washington and northern Idaho
- Idaho Department of Environmental Quality Lake Pend Oreille Watershed Advisory Group
- Rock Creek Alliance nonprofit works to protect the water quality of the Clark Fork-Pend Oreille Watershed and the Cabinet Mountains Wilderness Area (primarily from contamination from the mining industry)
- Lake Pend Oreille Waterkeeper environmental group part of the larger Waterkeeper Alliance 
LAKE PEND OREILLE INFORMATION
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